Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Copyright (c) 2009, Microsoft Corporation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Authors:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *   Haiyang Zhang <haiyangz@microsoft.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *   Hank Janssen  <hjanssen@microsoft.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/wait.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/vmalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/hyperv.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <asm/mshyperv.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include "hyperv_vmbus.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) struct vmbus_connection vmbus_connection = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	.conn_state		= DISCONNECTED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	.next_gpadl_handle	= ATOMIC_INIT(0xE1E10),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	.ready_for_suspend_event= COMPLETION_INITIALIZER(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 				  vmbus_connection.ready_for_suspend_event),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	.ready_for_resume_event	= COMPLETION_INITIALIZER(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 				  vmbus_connection.ready_for_resume_event),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) EXPORT_SYMBOL_GPL(vmbus_connection);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39)  * Negotiated protocol version with the host.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) __u32 vmbus_proto_version;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) EXPORT_SYMBOL_GPL(vmbus_proto_version);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45)  * Table of VMBus versions listed from newest to oldest.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) static __u32 vmbus_versions[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	VERSION_WIN10_V5_2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	VERSION_WIN10_V5_1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	VERSION_WIN10_V5,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	VERSION_WIN10_V4_1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	VERSION_WIN10,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	VERSION_WIN8_1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	VERSION_WIN8,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	VERSION_WIN7,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	VERSION_WS2008
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60)  * Maximal VMBus protocol version guests can negotiate.  Useful to cap the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61)  * VMBus version for testing and debugging purpose.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) static uint max_version = VERSION_WIN10_V5_2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) module_param(max_version, uint, S_IRUGO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) MODULE_PARM_DESC(max_version,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 		 "Maximal VMBus protocol version which can be negotiated");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) int vmbus_negotiate_version(struct vmbus_channel_msginfo *msginfo, u32 version)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	struct vmbus_channel_initiate_contact *msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	init_completion(&msginfo->waitevent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	msg = (struct vmbus_channel_initiate_contact *)msginfo->msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	memset(msg, 0, sizeof(*msg));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	msg->header.msgtype = CHANNELMSG_INITIATE_CONTACT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	msg->vmbus_version_requested = version;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	 * VMBus protocol 5.0 (VERSION_WIN10_V5) and higher require that we must
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	 * use VMBUS_MESSAGE_CONNECTION_ID_4 for the Initiate Contact Message,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	 * and for subsequent messages, we must use the Message Connection ID
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	 * field in the host-returned Version Response Message. And, with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	 * VERSION_WIN10_V5 and higher, we don't use msg->interrupt_page, but we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	 * tell the host explicitly that we still use VMBUS_MESSAGE_SINT(2) for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	 * compatibility.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	 * On old hosts, we should always use VMBUS_MESSAGE_CONNECTION_ID (1).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	if (version >= VERSION_WIN10_V5) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 		msg->msg_sint = VMBUS_MESSAGE_SINT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		vmbus_connection.msg_conn_id = VMBUS_MESSAGE_CONNECTION_ID_4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 		msg->interrupt_page = virt_to_phys(vmbus_connection.int_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		vmbus_connection.msg_conn_id = VMBUS_MESSAGE_CONNECTION_ID;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	msg->monitor_page1 = virt_to_phys(vmbus_connection.monitor_pages[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	msg->monitor_page2 = virt_to_phys(vmbus_connection.monitor_pages[1]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	msg->target_vcpu = hv_cpu_number_to_vp_number(VMBUS_CONNECT_CPU);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	 * Add to list before we send the request since we may
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	 * receive the response before returning from this routine
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	list_add_tail(&msginfo->msglistentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 		      &vmbus_connection.chn_msg_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	ret = vmbus_post_msg(msg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 			     sizeof(struct vmbus_channel_initiate_contact),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 			     true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	trace_vmbus_negotiate_version(msg, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	if (ret != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 		list_del(&msginfo->msglistentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 					flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	/* Wait for the connection response */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	wait_for_completion(&msginfo->waitevent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	list_del(&msginfo->msglistentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	/* Check if successful */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	if (msginfo->response.version_response.version_supported) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		vmbus_connection.conn_state = CONNECTED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 		if (version >= VERSION_WIN10_V5)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 			vmbus_connection.msg_conn_id =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 				msginfo->response.version_response.msg_conn_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		return -ECONNREFUSED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)  * vmbus_connect - Sends a connect request on the partition service connection
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) int vmbus_connect(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	struct vmbus_channel_msginfo *msginfo = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	int i, ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	__u32 version;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	/* Initialize the vmbus connection */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	vmbus_connection.conn_state = CONNECTING;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	vmbus_connection.work_queue = create_workqueue("hv_vmbus_con");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	if (!vmbus_connection.work_queue) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	vmbus_connection.handle_primary_chan_wq =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		create_workqueue("hv_pri_chan");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	if (!vmbus_connection.handle_primary_chan_wq) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	vmbus_connection.handle_sub_chan_wq =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 		create_workqueue("hv_sub_chan");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	if (!vmbus_connection.handle_sub_chan_wq) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	INIT_LIST_HEAD(&vmbus_connection.chn_msg_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	spin_lock_init(&vmbus_connection.channelmsg_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	INIT_LIST_HEAD(&vmbus_connection.chn_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	mutex_init(&vmbus_connection.channel_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	 * Setup the vmbus event connection for channel interrupt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	 * abstraction stuff
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	vmbus_connection.int_page =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	(void *)hv_alloc_hyperv_zeroed_page();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	if (vmbus_connection.int_page == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	vmbus_connection.recv_int_page = vmbus_connection.int_page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	vmbus_connection.send_int_page =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		(void *)((unsigned long)vmbus_connection.int_page +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 			(HV_HYP_PAGE_SIZE >> 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	 * Setup the monitor notification facility. The 1st page for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	 * parent->child and the 2nd page for child->parent
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	vmbus_connection.monitor_pages[0] = (void *)hv_alloc_hyperv_zeroed_page();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	vmbus_connection.monitor_pages[1] = (void *)hv_alloc_hyperv_zeroed_page();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	if ((vmbus_connection.monitor_pages[0] == NULL) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	    (vmbus_connection.monitor_pages[1] == NULL)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	msginfo = kzalloc(sizeof(*msginfo) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 			  sizeof(struct vmbus_channel_initiate_contact),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 			  GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	if (msginfo == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 		ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	 * Negotiate a compatible VMBUS version number with the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	 * host. We start with the highest number we can support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	 * and work our way down until we negotiate a compatible
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	 * version.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	for (i = 0; ; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		if (i == ARRAY_SIZE(vmbus_versions)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 			ret = -EDOM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 			goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 		version = vmbus_versions[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 		if (version > max_version)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 		ret = vmbus_negotiate_version(msginfo, version);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 		if (ret == -ETIMEDOUT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 			goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 		if (vmbus_connection.conn_state == CONNECTED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	vmbus_proto_version = version;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	pr_info("Vmbus version:%d.%d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 		version >> 16, version & 0xFFFF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	vmbus_connection.channels = kcalloc(MAX_CHANNEL_RELIDS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 					    sizeof(struct vmbus_channel *),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 					    GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	if (vmbus_connection.channels == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 		ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 		goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	kfree(msginfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) cleanup:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	pr_err("Unable to connect to host\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	vmbus_connection.conn_state = DISCONNECTED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	vmbus_disconnect();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	kfree(msginfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) void vmbus_disconnect(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	 * First send the unload request to the host.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	vmbus_initiate_unload(false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	if (vmbus_connection.handle_sub_chan_wq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 		destroy_workqueue(vmbus_connection.handle_sub_chan_wq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	if (vmbus_connection.handle_primary_chan_wq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 		destroy_workqueue(vmbus_connection.handle_primary_chan_wq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	if (vmbus_connection.work_queue)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 		destroy_workqueue(vmbus_connection.work_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	if (vmbus_connection.int_page) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 		hv_free_hyperv_page((unsigned long)vmbus_connection.int_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 		vmbus_connection.int_page = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	hv_free_hyperv_page((unsigned long)vmbus_connection.monitor_pages[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	hv_free_hyperv_page((unsigned long)vmbus_connection.monitor_pages[1]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	vmbus_connection.monitor_pages[0] = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	vmbus_connection.monitor_pages[1] = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303)  * relid2channel - Get the channel object given its
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304)  * child relative id (ie channel id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) struct vmbus_channel *relid2channel(u32 relid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	if (WARN_ON(relid >= MAX_CHANNEL_RELIDS))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	return READ_ONCE(vmbus_connection.channels[relid]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314)  * vmbus_on_event - Process a channel event notification
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316)  * For batched channels (default) optimize host to guest signaling
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317)  * by ensuring:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318)  * 1. While reading the channel, we disable interrupts from host.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319)  * 2. Ensure that we process all posted messages from the host
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320)  *    before returning from this callback.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321)  * 3. Once we return, enable signaling from the host. Once this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322)  *    state is set we check to see if additional packets are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323)  *    available to read. In this case we repeat the process.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)  *    If this tasklet has been running for a long time
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325)  *    then reschedule ourselves.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) void vmbus_on_event(unsigned long data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	struct vmbus_channel *channel = (void *) data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	unsigned long time_limit = jiffies + 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	trace_vmbus_on_event(channel);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	hv_debug_delay_test(channel, INTERRUPT_DELAY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 		void (*callback_fn)(void *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 		/* A channel once created is persistent even when
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 		 * there is no driver handling the device. An
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 		 * unloading driver sets the onchannel_callback to NULL.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 		callback_fn = READ_ONCE(channel->onchannel_callback);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 		if (unlikely(callback_fn == NULL))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 			return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 		(*callback_fn)(channel->channel_callback_context);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 		if (channel->callback_mode != HV_CALL_BATCHED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 			return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 		if (likely(hv_end_read(&channel->inbound) == 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 			return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 		hv_begin_read(&channel->inbound);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 	} while (likely(time_before(jiffies, time_limit)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 	/* The time limit (2 jiffies) has been reached */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	tasklet_schedule(&channel->callback_event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362)  * vmbus_post_msg - Send a msg on the vmbus's message connection
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) int vmbus_post_msg(void *buffer, size_t buflen, bool can_sleep)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 	struct vmbus_channel_message_header *hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 	union hv_connection_id conn_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 	int retries = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 	u32 usec = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	conn_id.asu32 = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	conn_id.u.id = vmbus_connection.msg_conn_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	 * hv_post_message() can have transient failures because of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 	 * insufficient resources. Retry the operation a couple of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 	 * times before giving up.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 	while (retries < 100) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 		ret = hv_post_message(conn_id, 1, buffer, buflen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 		switch (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 		case HV_STATUS_INVALID_CONNECTION_ID:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 			/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 			 * See vmbus_negotiate_version(): VMBus protocol 5.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 			 * and higher require that we must use
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 			 * VMBUS_MESSAGE_CONNECTION_ID_4 for the Initiate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 			 * Contact message, but on old hosts that only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 			 * support VMBus protocol 4.0 or lower, here we get
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 			 * HV_STATUS_INVALID_CONNECTION_ID and we should
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 			 * return an error immediately without retrying.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 			hdr = buffer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 			if (hdr->msgtype == CHANNELMSG_INITIATE_CONTACT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 				return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 			/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 			 * We could get this if we send messages too
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 			 * frequently.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 			ret = -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 		case HV_STATUS_INSUFFICIENT_MEMORY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 		case HV_STATUS_INSUFFICIENT_BUFFERS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 			ret = -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 		case HV_STATUS_SUCCESS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) 		default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 			pr_err("hv_post_msg() failed; error code:%d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 		retries++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) 		if (can_sleep && usec > 1000)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 			msleep(usec / 1000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) 		else if (usec < MAX_UDELAY_MS * 1000)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) 			udelay(usec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 			mdelay(usec / 1000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) 		if (retries < 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 			usec *= 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429)  * vmbus_set_event - Send an event notification to the parent
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) void vmbus_set_event(struct vmbus_channel *channel)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) 	u32 child_relid = channel->offermsg.child_relid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) 	if (!channel->is_dedicated_interrupt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) 		vmbus_send_interrupt(child_relid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) 	++channel->sig_events;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) 	hv_do_fast_hypercall8(HVCALL_SIGNAL_EVENT, channel->sig_event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) EXPORT_SYMBOL_GPL(vmbus_set_event);